METHOD AND DEVICE FOR CONTROLLING TENSION OF ROLLING MATERIAL AND POSITION OF LOOPER IN CONTINUOUS HOT MILL

摘要

PURPOSE:To improve the accuracy and stability of control by controlling the speed of a driving motor and the peripheral speed of a roll in accordance with the differences between the angle of a mechanical type looper driven by a motor and the detected values of a tension imposed on a rolling material between stands and respective target values corresponding to said angle and tension. CONSTITUTION:An angle of a looper 3 of a continuous hot mill equipped with an electric current controlling device 9 of a looper motor 7, a speed controlling device 14, and a looper position detector 11, etc., is detected. A speed of the motor 7 is controlled in accordance with the difference between the detected value and a target angle. Further, a tension imposed on a rolling material 20 between stands is detected by a tension detector 18, and a peripheral speed of the roll of a stand at the front stage or at the rear stage of adjoining stands is controlled in accordance with the difference between the detected value and a target tension. Thus, a looper angle and a material tension are controlled respectively by independent control systems to improve the accuracy and stability of each system.